Drew3287 Posted May 11, 2014 Share Posted May 11, 2014 I have a sr250 custom bobber, I've cleaned the carb multiple times, still doesn't help much. It will crank and idle, was only running only on half choke, it will idle and ride now with choke off but still wants to spit back through the carb and backfire, also wants to shut off sometimes at stops. How can I fix this? Link to comment Share on other sites More sharing options...
blackhat250 Posted May 11, 2014 Share Posted May 11, 2014 Hi drew , spit back usually means the inlet valve aint closed proper, check timing and valve clearance.. how many miles on her ? Link to comment Share on other sites More sharing options...
Drew3287 Posted May 11, 2014 Author Share Posted May 11, 2014 Odometer shows about 5000 but there's no speedo cable, so not exactly sure, but it's got to be close,I got this bike on a trade and just trying to get it riding, I'm kinda new to bike engines, any help on adjusting valves etc. would be very helpful Link to comment Share on other sites More sharing options...
Drew3287 Posted May 11, 2014 Author Share Posted May 11, 2014 Also it has a CDI box so timing shouldn't be a big issue according to what I've read....? Link to comment Share on other sites More sharing options...
blackhat250 Posted May 11, 2014 Share Posted May 11, 2014 Ok " do a compression test, next,,, 1 Link to comment Share on other sites More sharing options...
Drew3287 Posted May 11, 2014 Author Share Posted May 11, 2014 Ok, I adjusted the intake valve, ran a lot better, but went back the same after a lil while, I've tested compression before, had 150 psi Link to comment Share on other sites More sharing options...
Drew3287 Posted May 11, 2014 Author Share Posted May 11, 2014 Ok, done valve adjustment, tried 3 different plugs, cranks and runs on half choke, runs for a while and shuts off off choke and still spits and backfires when I rev it and let off, could there be a spark problem, electrical issue. I'm at a loss ,really need some advice here Link to comment Share on other sites More sharing options...
blackhat250 Posted May 11, 2014 Share Posted May 11, 2014 Runs on half choke ? then its lean, is there a air filtre on her,,, screw air/ pilot screw in,,a half turn, Link to comment Share on other sites More sharing options...
Drew3287 Posted May 12, 2014 Author Share Posted May 12, 2014 Adjusted pilot screw in all the way them out 1 and 1/4 the 1 and 1/2. No air filter, gotta get one. May try soaking carb, idk what else to do besides maybe rejecting carb Link to comment Share on other sites More sharing options...
Drew3287 Posted May 12, 2014 Author Share Posted May 12, 2014 Rejetting* Link to comment Share on other sites More sharing options...
AndrewElvisFan Posted May 12, 2014 Share Posted May 12, 2014 I'm no expert (see my other posts!) but without a filter to resist air flow you will not be getting enough fuel through. This is probably why she idles ok on half choke. Link to comment Share on other sites More sharing options...
blackhat250 Posted May 12, 2014 Share Posted May 12, 2014 I'm no expert (see my other posts!) but without a filter to resist air flow you will not be getting enough fuel through. This is probably why she idles ok on half choke. Thats an expert assumption Andre,,, .... its the cause... Link to comment Share on other sites More sharing options...
Drew3287 Posted May 12, 2014 Author Share Posted May 12, 2014 I actually kinda figured that, gonna get one tomorrow and see what happens, thanks for the advice guys , I'll repost the results later 1 Link to comment Share on other sites More sharing options...
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